| Year | Value | | 2024 | 571,732 | | 2023 | 550,863 | | 2022 | 534,520 | | 2021 | 522,537 | | 2020 | 506,401 | | 2019 | 486,487 | | 2018 | 467,901 | | 2017 | 450,560 | | 2016 | 434,589 | | 2015 | 420,702 | | 2014 | 405,236 | | 2013 | 388,541 | | 2012 | 373,538 | | 2011 | 357,168 | | 2010 | 342,932 | | 2009 | 331,796 | | 2008 | 318,915 | | 2007 | 311,229 | | 2006 | 304,797 | | 2005 | 291,671 | | 2004 | 282,104 | | 2003 | 275,648 | | 2002 | 264,211 | | 2001 | 256,411 | | 2000 | 260,997 | | 1999 | 262,692 | | 1998 | 254,308 | | 1997 | 243,974 | | 1996 | 233,204 | | 1995 | 222,679 | | 1994 | 211,464 | | 1993 | 194,877 | | 1992 | 174,355 | | 1991 | 162,220 | | 1990 | 161,157 | | 1989 | 160,204 | | 1988 | 156,545 | | 1987 | 155,220 | | 1986 | 155,936 | | 1985 | 156,430 | | 1984 | 153,518 | | 1983 | 150,057 | | 1982 | 151,401 | | 1981 | 164,955 | | 1980 | 182,688 | | 1979 | 190,147 | | 1978 | 190,211 | | 1977 | 187,139 | | 1976 | 183,906 | | 1975 | 180,546 |
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